Write down title ideas. Sometimes the right title can spark an entire poem. Devote a section of your journal to titles and spend a little time brainstorming. Think of as many titles as you can, even if they don't inspire a poem at the moment. What doesn't make sense today may make sense tomorrow.
List as many rhymes as you can. If a rhyme comes to you, write it in your journal whether you can use it or not. It might come in handy when you're searching for a rhyme.
Write stanzas (verses) out of context. A beautiful stanza may not have a home in one of your current poems, but it might inspire a poem or fit into an existing poem in the future.
Create word scenery. Look around you. Take note of your surroundings, wherever you may be, and take the time to describe the area in a verse or two. At the very least, even if you never use what you write, it's a good exercise to help you develop your descriptive power with words.
Copy some of your favorite poems as an exercise. Copying your favorite poems is a way to involve and interact with the poem. Although you didn't originally write it, this allows you to get inside the poem creatively. Copying your favorite poems can also be a relaxing way to let your mind wander.